The Efinity 1000W HPS grow lights are a double-ended fixture.  The completely sealed housing has one RJ11 plug but no moving parts.  This fixture is suitable for high-frequency 400V electronic horticultural lamps with 10-25% more output than traditional HPS lamps.  Grow Lights 1000W such as the Efinity line have a replaceable 96% efficient reflector.
 

• Is there a warranty for the 1000W Grow Lights?  Yes.  3 Years